/Engine/Plugins/Online/OnlineFramework/Source/Party/Public/Party/SocialParty.h
bool TryInviteUser ( const [USocialUser](API\Plugins\Party\User\USocialUser) & UserToInvite, const [ESocialPartyInviteMethod](API\Plugins\Party\Party\ESocialPartyInviteMethod) InviteMethod, const [FString](API\Runtime\Core\Containers\FString) & MetaData )